Fragment

package com.bertho.tdashboard.fragment;


import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.bertho.tdashboard.R;
import com.bertho.tdashboard.model.NewVisitor;
import com.bertho.tdashboard.model.NewVisitorResponse;
import com.bertho.tdashboard.rest.ApiClient;
import com.bertho.tdashboard.rest.ApiInterface;

import java.util.ArrayList;
import java.util.List;

import butterknife.ButterKnife;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

import lecho.lib.hellocharts.gesture.ZoomType;
import lecho.lib.hellocharts.listener.ColumnChartOnValueSelectListener;
import lecho.lib.hellocharts.model.Axis;
import lecho.lib.hellocharts.model.Column;
import lecho.lib.hellocharts.model.ColumnChartData;
import lecho.lib.hellocharts.model.SubcolumnValue;
import lecho.lib.hellocharts.util.ChartUtils;
import lecho.lib.hellocharts.view.Chart;
import lecho.lib.hellocharts.view.ColumnChartView;

public class WebStaticFragment extends Fragment {

    private static final String TAG = WebStaticFragment.class.getSimpleName();

    List<NewVisitor> listVisitor;

    ProgressDialog progress;

    private static final int DEFAULT_DATA = 0;
    private static final int SUBCOLUMNS_DATA = 1;
    private static final int STACKED_DATA = 2;
    private static final int NEGATIVE_SUBCOLUMNS_DATA = 3;
    private static final int NEGATIVE_STACKED_DATA = 4;

    private ColumnChartView chart;
    private ColumnChartData data;
    private boolean hasAxes = true;
    private boolean hasAxesNames = true;
    private boolean hasLabels = false;
    private boolean hasLabelForSelected = false;
    private int dataType = DEFAULT_DATA;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_statistic, container, false);
        ButterKnife.bind(this, rootView);

        chart = (ColumnChartView) rootView.findViewById(R.id.chart);
        chart.setOnValueTouchListener(new ValueTouchListener());

        listVisitor = new ArrayList<>();

        load();
        //generateDefaultData();

        return rootView;
    }

    private void load() {

        progress = ProgressDialog.show(getActivity(), "Retrieving Data", "Please wait...", true);
        progress.setIndeterminate(true);

        ApiInterface apiService = ApiClient.getVisitor().create(ApiInterface.class);
        Call<NewVisitorResponse> call = apiService.getVisitor();


        call.enqueue(new Callback<NewVisitorResponse>() {
            @Override
            public void onResponse(Call<NewVisitorResponse> call, Response<NewVisitorResponse> response) {
                listVisitor = response.body().getVisitor();

                // Please combine with generateDefaultData() function with listVisitor data
            }

            @Override
            public void onFailure(Call<NewVisitorResponse> call, Throwable t) {
                Log.d(TAG, "STATUS CODE : " + t.toString());
                Snackbar.make(getView(), "CONNECTION ERROR. PLEASE TRY AGAIN", Snackbar.LENGTH_LONG).setAction("Action", null).show();
            }
        });
    }

    private void generateDefaultData() {
        int numSubcolumns = 1;
        int numColumns = 10;
        // Column can have many subcolumns, here by default I use 1 subcolumn in each of 8 columns.
        List<Column> columns = new ArrayList<Column>();
        List<SubcolumnValue> values;

        for (int i = 0; i < numColumns; ++i) {

            values = new ArrayList<SubcolumnValue>();
            for (int j = 0; j < numSubcolumns; ++j) {
                values.add(new SubcolumnValue((float) Math.random() * 50f + 5, ChartUtils.pickColor()));
            }

            Column column = new Column(values);
            column.setHasLabels(hasLabels);
            column.setHasLabelsOnlyForSelected(hasLabelForSelected);
            columns.add(column);
        }

        data = new ColumnChartData(columns);

        if (hasAxes) {
            Axis axisX = new Axis();
            Axis axisY = new Axis().setHasLines(true);
            if (hasAxesNames) {
                axisX.setName("Tanggal");
                axisY.setName("Total Visitor");
            }
            data.setAxisXBottom(axisX);
            data.setAxisYLeft(axisY);
        } else {
            data.setAxisXBottom(null);
            data.setAxisYLeft(null);
        }

        chart.setColumnChartData(data);
    }

    private class ValueTouchListener implements ColumnChartOnValueSelectListener {

        @Override
        public void onValueSelected(int columnIndex, int subcolumnIndex, SubcolumnValue value) {
            Toast.makeText(getActivity(), "Total Visitor : " + value, Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onValueDeselected() {
            // TODO Auto-generated method stub
        }

    }
}